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Texas Instruments SN74LVCH16952ADL
- Part No.:
- SN74LVCH16952ADL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCH16952ADL.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
SN74LVCH16952ADL from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between A and B buses in 1.65-V to 3.6-V systems. It features dual 8-bit register sets, bus-hold inputs, Ioff partial-power-down support, and mixed-mode 5-V-tolerant inputs - enabling use as a level translator in 3.3-V/5-V mixed-signal interfaces such as memory expansion or FPGA-to-ASIC interconnects.
For engineers reviewing the SN74LVCH16952ADL datasheet, SN74LVCH16952ADL pinout, SN74LVCH16952ADL application, or SN74LVCH16952ADL equivalent, key selection criteria include tpd ≤6.6 ns at 3.3 V, 56-pin SSOP (DL) package compatibility, 16-bit registered buffering with independent clock/enable control per direction, and bus-hold functionality eliminating external pull resistors.
Technical Context
The SN74LVCH16952ADL implements two independent 8-bit D-type flip-flop banks - one for A→B and another for B→A data paths - each controlled by dedicated CLK, CE, and OE signals. Data latching occurs on the low-to-high clock transition when CE is low, and outputs enter high-impedance state when OE is high.
Its Ioff circuitry disables all outputs during power-down to prevent backflow current, while bus-hold inputs maintain valid logic levels on floating A/B data lines without external components. Input tolerance up to 5.5 V enables direct interfacing with 5-V logic in 3.3-V VCC systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports modern low-voltage logic domains including 1.8-V, 2.5-V, and 3.3-V systems |
| Max Propagation Delay (tpd) | 6.6 ns at VCC = 3.3 V - ensures timing-critical 16-bit parallel bus operation up to 150 MHz clock frequency |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to legacy 5-V peripherals without level-shifting circuitry |
| Ioff Support | Active during power-down - blocks reverse current flow between powered and unpowered system domains |
| Bus-Hold Inputs | Integrated on all A/B data pins - eliminates need for external pullup/pulldown resistors on unused or unterminated lines |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive standard CMOS loads across PCB traces and moderate fanout |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
Pinout & Package
SN74LVCH16952ADL is housed in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch and 13.9 mm × 6.1 mm body dimensions. The package is RoHS-compliant, moisture sensitivity level 1, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers for respective 8-bit port segments; high = high-Z, low = enabled |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register Clock (positive-edge) | Samples A or B bus data into D-flip-flops on rising edge when corresponding CE is low |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Register Clock Enable (active-low) | Gates clock propagation to flip-flops; low = clock active, high = latch holds previous state |
| A1–A8, B1–B8 (x2 sets) | Bidirectional Data I/O | 16-bit parallel data ports with bus-hold and 5.5-V tolerant inputs; outputs drive ±24 mA |
| VCC, GND (x8 total) | Power & Ground | Distributed supply/ground pins minimize switching noise and improve signal integrity across wide bus |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | 5-V-tolerant inputs with 3.3-V VCC enable seamless interface between legacy 5-V logic and modern low-voltage domains |
| Bus-hold circuitry | Eliminates external pull resistors on A/B data lines, reducing BOM count and board space in high-pin-count applications |
| Ioff partial-power-down protection | Prevents damaging current backflow when device is unpowered but connected to live buses - critical for hot-swap and modular systems |
| Low propagation delay | 6.6 ns max at 3.3 V supports high-speed 16-bit data transfer in real-time control and memory-mapped I/O subsystems |
| Widebus™ architecture | Optimized layout and drive strength for noise-immune parallel bus operation with minimal ground bounce (VOLP < 0.8 V) |
Applications
| Memory Expansion Interface | FPGA-to-Microcontroller Bridge |
|---|---|
Use Scenario: Connecting a 16-bit SRAM or Flash memory to a microcontroller with mismatched voltage domains (e.g., 3.3-V MCU, 5-V memory). IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, level-translated bidirectional data path with clock-controlled latching and 3-state isolation during memory access cycles. Use Value: Enables reliable read/write handshaking without external level shifters or glue logic, leveraging built-in bus-hold to stabilize address/data lines during chip select transitions. | Use Scenario: Interfacing a Xilinx Artix-7 FPGA's 16-bit user I/O bank (3.3-V LVTTL) to an ARM Cortex-M7 MCU operating at 1.8-V core but 3.3-V I/O. IC Role / Device Role / Timing Role: Bidirectional registered buffer that retimes and isolates data transfers between asynchronous clock domains while maintaining voltage compatibility. Use Value: Reduces timing closure complexity by providing deterministic setup/hold margins (tsu ≥2.8 ns, th ≥0.5 ns at 3.3 V) and eliminates need for discrete termination or biasing networks. |
| Industrial PLC Backplane Bus | Test Equipment Digital I/O Module |
Use Scenario: Implementing a hot-swappable 16-bit parallel bus segment in a programmable logic controller rack where modules may be inserted or removed under power. IC Role / Device Role / Timing Role: Isolation and translation transceiver with Ioff and bus-hold ensuring safe insertion/removal without disrupting adjacent powered modules or causing bus contention. Use Value: Prevents backfeed current and maintains stable logic states on floating lines during module reconfiguration - meeting IEC 61000-4-2 and industrial safety requirements. | Use Scenario: Building a 16-channel digital pattern generator/analyzer card requiring precise edge-aligned stimulus and response capture. IC Role / Device Role / Timing Role: Registered transceiver used as a synchronous input sampler and output driver, with independent clock/enable controls per 8-bit half-bus for flexible test vector sequencing. Use Value: Delivers sub-7-ns propagation delay and tight skew control (<1 ns) across all 16 bits, enabling accurate timing margin analysis at >100 MHz test frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADGGR | No internal registers; non-latched 3-state transceiver only - lacks clocked storage and timing control | Suitable for simple bus buffering without synchronization; cannot replace registered behavior in timing-critical paths | Select SN74LVC16245ADGGR only if clocked registration is unnecessary and lower propagation delay (5.2 ns) is prioritized over data retention |
| SN74AVC16T245DGGR | Auto-direction sensing, no separate CLK/CE/OE controls; supports 1.2-V to 3.6-V VCC and higher speed (tpd = 3.2 ns) | Better for dynamic bidirectional buses (e.g., I²C-like protocols); unsuitable where independent A→B/B→A control and register staging are required | Choose SN74AVC16T245DGGR for compact, auto-directional translation; retain SN74LVCH16952ADL when explicit clocked staging and dual-port control are mandatory |
Compared with SN74LVC16245ADGGR and SN74AVC16T245DGGR, the SN74LVCH16952ADL uniquely provides dual 8-bit registered paths with independent clock/enable per direction - essential for synchronous data capture, pipeline staging, and deterministic timing in memory-mapped or real-time control interfaces.
Availability
SN74LVCH16952ADL is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA-to-MCU bridges, industrial PLC backplanes, test equipment I/O modules, and hot-swap-capable embedded subsystems requiring stable component supply and long-term manufacturability.
Supply support for SN74LVCH16952ADL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability interface ICs and widebus architectures.
The SN74LVCH16952ADL belongs to TI's Widebus™ family of advanced logic devices, engineered specifically for high-speed, noise-immune parallel bus applications in industrial automation, communications infrastructure, and test instrumentation.
FAQ
What is the maximum clock frequency supported by the SN74LVCH16952ADL?
The SN74LVCH16952ADL supports a maximum clock frequency of 150 MHz at VCC = 3.3 V, as specified in the timing requirements table. This rating assumes proper signal integrity, load capacitance ≤50 pF, and ambient temperature within –40°C to +85°C. At lower VCC (e.g., 1.8 V), max frequency reduces to 130 MHz due to reduced drive strength and increased propagation delay.
Does the SN74LVCH16952ADL require external pull-up or pull-down resistors on its data lines?
No, the SN74LVCH16952ADL integrates bus-hold circuitry on all A and B port data inputs, which actively maintains valid logic levels on floating or unterminated lines. Using external pull resistors with bus-hold enabled is not recommended, as it may cause excessive current draw or logic instability. The feature eliminates BOM components and simplifies PCB layout for high-density 16-bit interfaces.
Can the SN74LVCH16952ADL operate safely when one side of the bus is powered and the other is not?
Yes, the SN74LVCH16952ADL includes Ioff circuitry that disables all outputs during partial power-down, preventing damaging current backflow between powered and unpowered sections of the system. This capability is verified per JESD 78 and supports hot-plug and modular system designs where subsystems may be powered independently - a key requirement for industrial PLCs and telecom line cards.
What package type is used for the SN74LVCH16952ADL, and is it compatible with standard SSOP footprints?
The SN74LVCH16952ADL uses the DL package: a 56-pin Shrink Small-Outline Package with 0.5-mm lead pitch, 13.9 mm × 6.1 mm body size, and 1.2-mm maximum height. It conforms to JEDEC MO-194 and is mechanically compatible with standard SSOP-56 land patterns. Thermal resistance θJA is 56°C/W, and the device is rated for reflow up to 260°C (MSL Level-1).
How does the SN74LVCH16952ADL handle level translation between 3.3-V and 5-V logic domains?
The SN74LVCH16952ADL accepts input voltages up to 5.5 V while operating from a 1.65-V to 3.6-V VCC supply, enabling direct 5-V-to-3.3-V translation on all A and B port inputs. Outputs swing rail-to-rail (0 V to VCC) and are 5.5-V tolerant in high-impedance state. This mixed-mode operation is achieved without external components and is fully characterized across temperature and voltage ranges in the official datasheet.
SN74LVCH16952ADL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74LVCH16952ADL FAQ
1.How can I place an order for SN74LVCH16952ADL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH16952ADL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74LVCH16952ADL reliable?
The price and inventory of SN74LVCH16952ADL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH16952ADL is usually 5 days.
3.What payment methods are accepted for SN74LVCH16952ADL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH16952ADL transactions.
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4.How is shipping managed for SN74LVCH16952ADL?
SN74LVCH16952ADL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH16952ADL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74LVCH16952ADL?
For technical support, including SN74LVCH16952ADL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH16952ADL requirements.
6.How does Aetrix verify that SN74LVCH16952ADL is sourced from the original manufacturer or authorized distributors?
All SN74LVCH16952ADL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVCH16952ADL meets industry standards.
7.What is the process for return or replacement of SN74LVCH16952ADL?
All SN74LVCH16952ADL units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH16952ADL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74LVCH16952ADL part is unused and in its original packaging.
Return procedure for SN74LVCH16952ADL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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